Cyanochroite
Cyanochroite is an IMA-recognized mineral species in the sulfate class, with the chemical formula K₂Cu(SO₄)₂·6H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1/a). It is a member of the Picromerite structural group.
Key properties: specific gravity 2.22; Vitreous luster; optically biaxial.
IMA symbol Cyc, grandfathered status — known before the IMA’s founding, named in 1855.
A rare product of fumarolic action (Vesuvius, Italy).
Its name comes from the Greek for blue and color, in reference to its appearance in white light.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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